use std::format instead of fmt::format

The std::format is sufficient for the uses in this repository except
for in one file (override_fan_target.cpp, since P2286 isn't supported
by GCC yet).  Switch to std::format whenever possible.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib2576fb530a4d7ce238e1b0bd95b40b476ec2107
diff --git a/control/json/triggers/parameter.cpp b/control/json/triggers/parameter.cpp
index 6f4eac3..6986608 100644
--- a/control/json/triggers/parameter.cpp
+++ b/control/json/triggers/parameter.cpp
@@ -17,7 +17,7 @@
 
 #include "../manager.hpp"
 
-#include <fmt/format.h>
+#include <format>
 
 namespace phosphor::fan::control::json::trigger::parameter
 {
@@ -30,7 +30,7 @@
 {
     if (!jsonObj.contains("parameter"))
     {
-        auto msg = fmt::format(
+        auto msg = std::format(
             "Event '{}' parameter trigger is missing 'parameter'", eventName);
         log<level::ERR>(msg.c_str());
         throw std::runtime_error(msg);